And I really like the theme music from the HBO program "From the Earth to the Moon". Especially the closing theme. At least I think it is the closing theme. The one that is also played when the Apollo 8 astronauts first see the Earth rising over the Moon.

John Williams and Gustav Holst both get my votes. I concur with Pete as well. Also, there is Debussy (Claire de Lune), how about David Bowie (you know), Rush (Countdown, Cygnus X1), The Police (Walking on the Moon)... so very much to choose from!

I listen to a lot of space-related music. One of my favorite bands is called Hawkwind, who were somewhat popular back in the seventies and were known primarily as a "space-rock" band. As such, they did a lot of concept albums which were usually based on some kind of space opera. One of my favorite songs of theirs is called "Time We Left this World Today" from the album "Doremi Fasol Latido" in 1972. Kind of obvious from the title; dirgey, doom-and-gloom, early 70's space advocate kind of song. Another good one is "Spirit of the Age," which is a song about a guy who goes on an interstellar journey with his girlfriend, but only one of them can afford to be deep-frozen... I can go on and on about that band.

I also like the song "Into the Void" by Black Sabbath, Master of Reality, 1971. Another one that illustrates really well the "doom-and-gloom" mentality of some of us pro-space types. (Not that I like to encourage that kind of thinking- but it's entertaining sometimes.)

I'm right now listening to the album "Angel's Egg (Radio Gnome Invisible Pt.2)" by Gong. They sang a lot about spaceships and other planets and such, but it was also rather silly, all being populated by pothead pixies and other fantastic types. Way-cool music, though.

And of course, I'm also a big fan of The Greatest Band Ever to Exist in the History of Humanity Period, usually known as Jethro Tull. You probably wouldn't expect them to have done any space music, but on their third album, "Benefit" (1970- and it also happens to be their best album,) they have a really awesome, way-cool acoustic song called, "For Michael Collins, Jeffrey, and Me". Which basically says, "That's way-cool, but dammit, I wanna go!"